我想使用C ++ Interactive Brokers API来请求历史数据。 但文档非常糟糕，我找不到Type TagValueListSPtr（最后一个参数）的示例。
contract.symbol="USD";
contract.secType="CASH";
contract.currency = "EUR";
contract.exchange = "IDEALPRO";
m_pClient->reqHistoricalData(1, contract, "20140920 00:00:00", "1 D", "1 day", "TRADES" 0, 2, ????);
文档位于https://www.interactivebrokers.com/en/software/api/apiguide/c/reqhistoricaldata.htm